P.I.C./ British Thornton Slide Rules 

Founded in 1880 at 109 Deansgate, Manchester by Alexander George Thornton, the firm grew to become one of the largest manufacturers of drawing instruments and slide rules in Britain. The Precision Instrument Co was taken over in 1901 and PIC continued to be used by Thornton as a trade mark until about 1970. The firm became British Thornton in 1967 and merged with ESF at Burley in 1992. British Thornton is now a manufacturer of school furniture in Keighley

Thornton PIC Electrical and Mechanical Engineer’s Rule. 10” celluloid faced mahogany slide rule

The mahogany and celluloid slide rule has a metal & glass  PC7a cursor. It has a green, cloth covered card case

With slide references of S,L,T, HP, KW, AMP, Prod, Quot, Voilt & Dynamo. Circa 1939 and was very kindly donated by Jim Odell

Manufacturer: Thornton
Date: 1939

This exhibit has a reference ID of CH31223. Please quote this reference ID in any communication with the Centre for Computing History.

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